High-Efficiency Gas Turbine System Using Isothermal Compression : 1st Report, Performance Estimation

Abstract

If the compression process of a regenerative gas turbine cycle is replaced by an isothermal process, higher thermal efficiency can be expected. This combination of Brayton and Ericsson cycles has a potentially higher efficiency. Isothermal compression can be achieved using a hydraulic air compressor, which converts hydraulic energy into the energy of compressed air. It can be used as the compressor of the gas turbine system. The performance of the system was analyzed by assuming conventional operating conditions and component characteristics. As a result, the higher thermal efficiency of the system was proven, and an output larger than that of a conventional hydropower plant was obtained.